* [patch] mac80211: potential null dereference in mesh forwarding
@ 2011-01-03 5:43 Dan Carpenter
2011-01-03 7:45 ` Eric Dumazet
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2011-01-03 5:43 UTC (permalink / raw)
To: John W. Linville
Cc: Johannes Berg, David S. Miller, linux-wireless, netdev,
kernel-janitors
The printk() is supposed to be ratelimited but we should always goto out
when fwd_skb is NULL. Otherwise it gets dereferenced on the next line.
Signed-off-by: Dan Carpenter <error27@gmail.com>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 5e9d3bc..dc8b566 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1831,8 +1831,9 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
fwd_skb = skb_copy(skb, GFP_ATOMIC);
- if (!fwd_skb && net_ratelimit()) {
- printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
+ if (!fwd_skb) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
sdata->name);
goto out;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [patch] mac80211: potential null dereference in mesh forwarding
2011-01-03 5:43 [patch] mac80211: potential null dereference in mesh forwarding Dan Carpenter
@ 2011-01-03 7:45 ` Eric Dumazet
0 siblings, 0 replies; 2+ messages in thread
From: Eric Dumazet @ 2011-01-03 7:45 UTC (permalink / raw)
To: Dan Carpenter
Cc: John W. Linville, Johannes Berg, David S. Miller, linux-wireless,
netdev, kernel-janitors
Le lundi 03 janvier 2011 à 08:43 +0300, Dan Carpenter a écrit :
> The printk() is supposed to be ratelimited but we should always goto out
> when fwd_skb is NULL. Otherwise it gets dereferenced on the next line.
>
> Signed-off-by: Dan Carpenter <error27@gmail.com>
>
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index 5e9d3bc..dc8b566 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -1831,8 +1831,9 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
>
> fwd_skb = skb_copy(skb, GFP_ATOMIC);
>
> - if (!fwd_skb && net_ratelimit()) {
> - printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
> + if (!fwd_skb) {
> + if (net_ratelimit())
> + printk(KERN_DEBUG "%s: failed to clone mesh frame\n",
> sdata->name);
> goto out;
> }
Already discovered/coped by Milton Miller.
^ permalink raw reply [flat|nested] 2+ messages in thread
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